I bought a DHT22 sensor (http://www.sparkfun.com/products/10167 ) . I got also a library for reading data from here http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1295252628 . Can anyone explain me why I need a 4.7kOhm resistor? Is itfor data accuracy and not for hardware?
Anyway if I want to use the resistor btw data pin and Vcc do I just need to make a bridge btw them?